A KARAOKE company backed by some of Hong Kong's top entertainment figures has apologised to three senior police officers for listing their names as sponsors in a newspaper advertisement. The apology comes after the Sunday Morning Post revealed that the officers - who include an assistant commissioner of police - were questioned by their boss, Director of Operations Dick Lee Ming-kwai, over possible conflict of interest. Assistant commissioner (support) Lionel Lam Kin, Police Public Relations Bureau superintendent Gregory Lam Kwai-bun and New Territories North superintendent Li Wing-hong had demanded an apology over what their lawyers described as a 'discourteous and actionable act' by the company - Karaoke on Demand Hong Kong Ltd. The officers' names appeared alongside 65 others who had helped pay for a full-page advertisement for the company which appeared in at least two mass-circulation Chinese-language daily newspapers last month . The company is backed by movie and Canto-pop stars Andy Lau Tak-wah and Anita Mui Yim-fong plus other showbiz personalities. Set up earlier this year to supply equipment to hundreds of karaoke lounges across the territory, the firm also has backing from well-known entertainment figure Charles Heung Wah-keung, chairman of China Star Entertainment, and Albert Yeung Sau-shing, chairman of the Emperor Group. In a letter to the Post, the officers' solicitors, Henry Wan and Yeung, said: 'We have received a letter from [the company] confirming that the mistakes were caused by clerical error and our clients' names were wrongly put on the advertisement.' Assistant Commissioner of Police (support) Lionel Lam Kin - who earlier confirmed that he had received an invitation to the company's launch party in the Hong Kong Convention and Exhibition Centre - said he and the other officers were happy with the apology and were going to let the matter rest. 'The company has apologised profusely and I am going to let it rest. I understand they had two lists - one mailing and one for people willing to contribute towards the advert - they got the two lists mixed up. In any case I would not want to be associated with the company. But there is no point in making a small thing into a big thing,' said Mr Lam. Civil Service Bureau rules on conflict of interest state that an officer 'should avoid putting himself in a position where he might arouse any suspicion of dishonesty or of using his official position to benefit himself or favour his family and friends'. Karaoke on Demand director Yip Wai-jung, who is responsible for marketing the company's projects, could not be contacted for comment.